From 555d3efde4134b768c3d1fc99c5431f8ffe59bce Mon Sep 17 00:00:00 2001
From: Elp03 <helle@grasmo.no>
Date: Fri, 8 Mar 2024 11:48:49 +0100
Subject: [PATCH] add calculating code

---
 prosjekt.X/main.c                       | 36 +++++++++++++++++++++++++
 prosjekt.X/nbproject/configurations.xml |  1 +
 prosjekt.X/themistor-temp.h             | 23 ++++++++++++++++
 prosjekt.X/thermistor-temp.c            |  1 +
 4 files changed, 61 insertions(+)
 create mode 100644 prosjekt.X/themistor-temp.h
 create mode 100644 prosjekt.X/thermistor-temp.c

diff --git a/prosjekt.X/main.c b/prosjekt.X/main.c
index b42afa9..5483a2b 100644
--- a/prosjekt.X/main.c
+++ b/prosjekt.X/main.c
@@ -12,6 +12,42 @@
 #include "uart.h"
 #include <util/delay.h>
 
+#define R_t0 10000
+#define T_0 298.15
+#define B 3950
+#define R_1 1000
+
+float R_therm;
+float V_1;
+float ln; 
+float T_therm;
+float V_therm;
+
+// Takes inn messured value 
+// Calculates the temperature in celcius
+// Returns the themperature
+float calculate_thermistor_temp(float readValue){
+    uint8_t V_tot = 5;
+    // Calculate Voltage over thermistor
+    V_therm = (V_tot/1024)*readValue;
+    
+    // Voltage accross R_1
+    V_1 = V_tot - V_therm; 
+    
+    // Calculate Thermistor resistanse
+    R_therm = (V_therm)/ (V_1 / R_1);
+    
+    // Steinhart-Harts formula
+    ln = log(R_therm/R_t0);
+    T_therm = (1/ ((ln/B) + (1/T_0)));
+    
+    // Temperatur in celcius
+    T_therm -= 273.15;
+    
+    return T_therm;
+}
+
+
 int main() {
     init_uart((uint16_t)9600);
     stdout = &USART_stream;
diff --git a/prosjekt.X/nbproject/configurations.xml b/prosjekt.X/nbproject/configurations.xml
index e8e1b9c..322cc4c 100644
--- a/prosjekt.X/nbproject/configurations.xml
+++ b/prosjekt.X/nbproject/configurations.xml
@@ -15,6 +15,7 @@
                    projectFiles="true">
       <itemPath>main.c</itemPath>
       <itemPath>uart.c</itemPath>
+      <itemPath>thermistor-temp.c</itemPath>
     </logicalFolder>
     <logicalFolder name="ExternalFiles"
                    displayName="Important Files"
diff --git a/prosjekt.X/themistor-temp.h b/prosjekt.X/themistor-temp.h
new file mode 100644
index 0000000..7b083d7
--- /dev/null
+++ b/prosjekt.X/themistor-temp.h
@@ -0,0 +1,23 @@
+/* 
+ * File:   themistor-temp.h
+ * Author: athamantis
+ *
+ * Created on 08 March 2024, 11:46
+ */
+
+#ifndef THEMISTOR_TEMP_H
+#define	THEMISTOR_TEMP_H
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+
+
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif	/* THEMISTOR_TEMP_H */
+
diff --git a/prosjekt.X/thermistor-temp.c b/prosjekt.X/thermistor-temp.c
new file mode 100644
index 0000000..8b13789
--- /dev/null
+++ b/prosjekt.X/thermistor-temp.c
@@ -0,0 +1 @@
+